Paṭikkūlamanasikārapabbaṁ
The Section about Applying the Mind to Repulsiveness

Puna ca paraṁ, As noted in the Introduction it appears from the other versions of the Satipaṭṭhāna practice in the Pāḷi discourses and from comparative studies of the texts in the early traditions that this section on replulsiveness is the only original section in Kāyānupassanā, which means that the rest of the meditations described in the discourse are later additions, which gives it special relevance. It should also be noted that traditionally the subject for meditation (kammaṭṭhāna) described here (kesā, lomā, nakhā, dantā, taco, etc.) is the first subject given to a newly ordained monastic, and may be taken as an introduction to the practice of mindfulness right at the beginning of the monastic's life.01 bhikkhave, bhikkhu imam-eva kāyaṁ -
Moreover, monks, a monk in regard to this very body -

uddhaṁ pādatalā, adho kesamatthakā, tacapariyantaṁ,
from the sole of the feet upwards, from the hair of the head down, bounded by the skin,

antaṁ, antaguṇaṁ, udariyaṁ, karīsaṁ, Only adds matthaluṅgaṁ, the brain, here and in the repetition below, which is an addition to the formula made in Medieval times. The list up to this point is of the items that have a preponderance of the earth-element, the ones after this point have a preponderance of the water-element. 02
intestines, mesentery, undigested food, excrement,

assu, vasā, kheḷo, siṅghāṇikā, lasikā, muttan”-ti.This is, of course, merely meant to be indicative of the sort of things found in the body, not a comprehensive list thereof, as can also be confirmed from the simile below where examples of grain are given, not a complete list of all known grains.03
tears, grease, spit, mucus, synovial fluid, urine.”

Seyyathā pi, bhikkhave, ubhatomukhā mutoli pūrā nānāvihitassa dhaññassa,
Just as though, monks, there were a bag open at both ends, full of various kinds of grain,